空气源热泵相变蓄能除霜蓄能特性实验研究

为了研究空气源热泵相变蓄能除霜过程中不同蓄热模式下的系统特性,在人工模拟环境下,对不同的蓄热模式特性进行了实验研究。实验结果表明：串联蓄热模式下,压缩机吸排气压力和温度分别稳定在0.38 MPa和1.65 MPa以及-6.9℃和75.0℃,而并联蓄热模式和单独蓄热模式下吸排气压力低至0.12 MPa和1.16 MPa,排气温度高达122.5℃。串联蓄热模式下,相变材料在蓄热过程中很好的完成相变,室内机出风温差达到18.0℃,压缩机耗功达到825 W。因此,串联蓄热模式下系统压力和温度等特性最为稳定,且蓄热过程时间较短,对室内供热影响最小,具有较强的可行性。

Experimental Analysis on Characteristics of Energy Storage for Defrosting of Air Source Heat Pump with Phase Change Energy Storage

The performances of energy storage modes are experimentally analyzed in the artificial environment in order to study the effect of energy storage modes for defrosting of air source heat pump with phase change energy storage.Results indicate that suction and discharge pressures are stable at 0.38 MPa and 1.65 MPa under the series energy storage mode,and suction and discharge temperatures are-6.9℃ and 75.0℃ respectively.However,the suction and discharge pressures are as low as 0.12 MPa and 1.16 MPa in parallel and single energy storage modes individually,and the discharge temperature is up to 122.5℃.In addition,in series energy storage mode,the phase change material can completely change from solid to liquid in energy storage process.The temperature difference is about 18.0℃ for indoor coil,and the input power to compressor is 825W.Therefore,the system pressures and temperatures are most stable in the series energy storage mode and the time for energy storage is short,which can meet the need of defrosting energy.